Pedosphere 29(3): 400--408, 2019
ISSN 1002-0160/CN 32-1315/P
©2019 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Remediation of Organochlorine Pesticide-Contaminated Soils by Surfactant-Enhanced Washing Combined with Activated Carbon Selective Adsorption |
ZHANG Shengtian1,2, HE Yue2, WU Linna3, WAN Jinzhong2 , YE Mao4, LONG Tao2, YAN Zhou2, JIANG Xin2, LIN Yusuo1, LU Xiaohua3 |
1College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);
2State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing 210042(China);
3Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan 430074(China);
4State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China) |
| ABSTRACT |
| Remediation of organochlorine pesticide (OCP)-contaminated soils is urgently required especially in China. The present study investigated the removal of OCPs from two soils by triton X-100 (TX-100)-enhanced washing coupled with powdered activated carbon (PAC) adsorption treatment of the solution. Two contaminated soils, including a silt clay contaminated with chlordene, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethanes (DDDs), and dichlorodiphenyltrichloroethane (DDT) and a sandy loam containing chlordanes and mirex, were selected. Effects of varied operating parameters, including TX-100 dosage, liquid/soil (L/S) ratio, and extraction time, on the contaminant removal were examined. For both soils, OCP removal was clearly enhanced with increasing TX-100 in extraction solution and L/S ratio. Meanwhile, the removal efficacy was also impacted by soil texture and characteristics and contents of the contaminants. Moreover, by using PAC as an absorbent, a significant decrease in the contaminants in the extraction solutions was detected, and TX-100 could be further reused. Our investigation suggests that surfactant-enhanced washing combined with activated carbon selective adsorption would be an alternative to remediate OCP-contaminated soils. |
| Key Words: chlordene,dichlorodiphenyltrichloroethane,hydrophobic organic chemicals,powdered activated carbon,sodium dodecyl benzene sulfonate,triton X-100 |
| Citation: Zhang S T, He Y, Wu L N, Wan J Z, Ye M, Long T, Yan Z, Jiang X, Lin Y S, Lu X H. 2019. Remediation of organochlorine pesticide-contaminated soils by surfactant-enhanced washing combined with activated carbon selective adsorption. Pedosphere. 29(3):400-408. |
|
View Full Text
|
|
|
|
